Leonardo da Vinci 'Lady with an Ermine' -

Lady with an Ermine is a painting by Leonardo da Vinci from around 1489–1490 and one of Poland's national treasures.

The subject of the portrait is Cecilia Gallerani, painted at a time when she was the mistress of Ludovico Sforza, Duke of Milan, and Leonardo was in the service of the duke. The painting is one of only four portraits of women painted by Leonardo considered by many to be the most beautiful.